Optimal diameter of diseased bifurcation segment: a practical rule for percutaneous coronary intervention
Yunlong Huo1, Gérard Finet, Thierry Lefèvre
1Department of Biomedical Engineering, Indiana University, Indianapolis, IN 46202, USA.
Insights
Determining optimal vessel diameters for bifurcations is crucial for percutaneous repair. The HK model accurately predicts optimal geometry for flow, outperforming other models across various bifurcation types.
Area of Science:
- Biomedical Engineering
- Cardiovascular Research
- Fluid Dynamics
Background:
- Percutaneous repair of diseased vessels requires optimal bifurcation geometry for efficient blood flow.
- Existing models for vessel diameter relationships at bifurcations include Murray, Finet, area-preservation, and HK models.
Purpose of the Study:
- To determine if an optimal diameter for a diseased vessel segment can be calculated given the diameters of the other two segments in a bifurcation.
- To evaluate and compare the predictive accuracy of four mathematical models for bifurcation geometry.
Main Methods:
- Comparison of four bifurcation diameter models (Murray, Finet, area-preservation, HK) against experimental measurements.
- Analysis of morphometric data from epicardial coronary bifurcations in human and swine subjects.
Main Results:
- The HK model demonstrated agreement with measurements for all bifurcation types, based on the minimum energy hypothesis.
- Murray and area-preservation models were accurate for daughter diameter ratios ≤0.25.
- The Finet model accurately predicted geometry for daughter diameter ratios ≥0.75.
Conclusions:
- The HK model offers a comprehensive and physically grounded approach for optimizing vessel diameters during percutaneous interventions.
- The HK model provides a superior framework for percutaneous reconstruction of diseased vessel segments compared to other models.
Aims:
The percutaneous repair of a diseased segment should consider the dimensions of other segments of a bifurcation in order to ensure the optimality of flow through the bifurcation. The question is, if the diameters of two segments of a bifurcation are known, can an optimal diameter of the third diseased segment be determined such that the bifurcation has an optimal geometry for flow transport? Various models (i.e., Murray, Finet, area-preservation and HK models) that express a diameter relationship of the three segments of a bifurcation have been proposed to answer the question.
Methods And Results:
In this study the four models were compared with experimental measurements on epicardial coronary bifurcations of patients and swine. The HK model is found to be in agreement with morphometric measurements of all bifurcation types and is based on the minimum energy hypothesis while Murray and area-preservation models are in agreement with experimental measurements for bifurcations with daughter diameter ratio (i.e., small daughter diameter/large daughter diameter) ≤0.25 and Finet model is in agreement for bifurcations with daughter diameter ratio ≥0.75.
Conclusions:
The HK model provides a comprehensive rule for the percutaneous reconstruction of the diameters of diseased vessels and has a physical basis.
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